<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>系统登录</title>
</head>
<body>
    <h1>系统登录</h1>
    <form action="/index">
        用户名：<input type="text" name="username" placeholder="请输入用户名">
        密码：<input type="password" name="password" placeholder="请输入密码">
        <input type="submit" value="登录">
    </form>
</body>
</html>